Drawing instrument.



Patented nac. 4, |900.

l No.l 663,065.

c. 6. c0x DRAWING INSTRUMENL (Appxicein med nu. 4,- 1899.1

(No Model.)

NvENTon @....g ATT0RNEy- No.'663,065f Patented Dec. 4, |900.

- '6. S. COX.

DRAWING INSTRUMENT.' (Aplicntion ledrJnn. 4, 1399.)

(Nn Nudel.) z sheets-sheet 2;

yvvnNEssEs: INVENTORl A ATTORNEY UNTTEE STATES A'PATENT OFFICE.

onARLEss. cox, OE ELIZABETH, NEw JERSEY.

DRAWING INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 663,065, dated December 4, 1900.

Application led January 4, 1899. Serial No. 701,098. (No model.)

T0 a/ZZ 71177/0111, it NM1/y conceive:

Beit known thatLCHARLES S.COX,acitizen of the United States, and a resident of Elizabeth, Union county, State of New Jersey, have invented a new and useful Drawing Instru- 1nent,ofwhich the following description,taken in connection with the drawings herewith accompanying, is a specification.

This invention has for its object to provide a cheap and simple drawing instrument that may be used as an ordinary T-square and also be capable of adjustment whereby a part thereof may be held in fixed connection with a drawingboard or other support and its blade be guided and operated relative to said fixed or stationary part so as to have a unform step-by-step movement over the drawing for the purpose of section-lining, shading, or otherwise. This object I secure by means of the construction and arrangement of parts, as hereinafter set forth in detail, and pointed out in the claims.

Referring to the drawings, Figure l is a perspective view of a drawing instrument embodying my invention, the same being shown in operative position in connection with a drawing-board- Fig. 2 is an enlarged perspective View of the instrument, showing the operating parts in full lines and the blade and head in dotted lines. Fig. 3 is a detail View illustrating the action of certain parts, to be hereinafter referred to. Fig. 4 is a sectional view through the center of the instrument with the blade broken away, and Fig. 5 is a side view of the same.

To explain in detail, l represents the blade, and 2 the head, of an ordinary T-square. According to my invention I connect a bar 3 with the inner edge of the head 2 in a suitable manner to permit of the latter, with its connected blade, having a sliding movement relative thereto'. Any suitable means may be employed for securing such connection between the parts 2 and 3, a simple and desirable means being the dovetail connection, as shown in the drawings. The said bar 3 is adapted to be held in fixed position relative to the drawingboard or other support on which the instrument is used, while the head and blade are operated relative thereto, and is therefore provided in the present instance shown with pins 4 4 for securing detachable connection with the edge of the d rawing-board. The inner side of the bar 3 or that side adjacent to the head 2 is provided with a rack 5, secured thereto, which is engaged by a pinion' 6, located in a chamber or recess in the head 2. This pinion 6 is connected with an operatingspindle 7, which is supported in the head 2, with its upper end extending above the surface of the latter and provided with a milled head S as a convenient means for operating the same and the connected pinion. By this construction and arrangement of parts the instrument may be placed in proper position upon a drawing-board, as shown in Fig. l, and the bar 3 be secured in a fixed position relative thereto by simply pressing its pins 4 4 into the edge of the board, after which the operator may readily move the blade l over the drawing with a uniform step-by step movement by turning the spindle 7, it being understood that the turning of the pinion relative to the stationary rack will cause a longitudinal movement of the head 2 and its connected blade.

The distance of movement 'of the blade l, which determines the space between the lines of the drawing, is of course regulated by the turning of the head S, which is operated with an intermittent movement. The operator readily becomes sufficiently expert in the manipulation of the instrument as to move the blade rapidly and with the greatest ac curacy, being materially assisted in this by reason of the hand resting upon or against the head 2 and being carried thereby. In some cases, however, and particularly in the case of beginners, it may be desirable lo have a means for indicating accurately the distance of each stepby-step movement of the blade. As a simple means for doing this I have provided the spindle '7 with a disk 9, having a series of notches 10 arranged at regular intervals apart, and have secured a spring-click 1l to the head 2, with its free end bearing against the periphery of said disk 9 and adapted to project into the notches therein. By this means it will be understood that as the spindle 7 is turned in the operation of moving the blade l the spring-click 1l, projecting into the successive notches in the disk 9,will indicate, both by sound and by the check to the movement of the spindle, the

distanceA between each of the notches, and therebythe proper distance of movement of the blade. In case it is desired to move the latter a greater distance than the space between each successive notch in the disk 9 the blade can be stopped at every alternate or other desired number of clicks. Any suitable means, however, for indicating the distance Vof the step-by-step movement of the blade other than that illustrated and described may ,be employed without departure from my invention.

The pins 4 4, with which the bar 3 is provided, arel in the present instance shown loosely supported within recesses in said bar and provided with openings through which a rod 12 extends. This rod l2 is supported in a longitudinally-movable position in the bar 3, with one end 13 projecting beyond the end thereof as a means for operating the same and isrforxned with two bends or cam portions 14 14, adjacent to the pins 4, which act upon the latterv when the rod is moved in one direction toforce the ends of the same outward beyond the face of the bar, as shown vby dotted lines in Fig. 3, and when the rod is moved in the opposite direction force the pin backward into -their recesses, as indicated byfull lines in said Fig. 3. The pins being' thus movable, whereby they may be shielded when not in use, I consider the preferable construction, although they may be stationary,- if desired.

The blade 1, as herein illustrated, is pivotally connected with the head 2, so as to be capable of being adjusted at any desired angle relative thereto, andas a'means for' holding said blade in fixed adjusted position I have provided the pivot-pin 15, which is su pported in a vertically-stationary position in the head 2, with a cam-lever 16, and have interposed betweenthe latter and the head 2 aiV cam washer or ring 17. By turning the lever 16 in the proper direction the blade 1 will be either clamped in fixed position or released forfurther adjustment.4 As a means to permit of the accurate adjustment of the blade relative to the head 2 I have provided the E more or less materially modified without departure fromfthe spirit of the invention.

What I claim, and desire to secure by Letters Patent, is-

1. A combined T-square and section-liner, comprising a cross-head and connected blade,

a bar having ar sliding dovetail connection with said head and being provided with a rack 2 on that edge located within the latter, a pinl ion located within a recess in the cross-head and engaging with said-rack,.and an operating-spindle carried by the cross-head having connection with said pinionto operate the same and being arranged with one end projecting above the upper, surface of the crosshead to beoperate'd, substantially as and for the purpose set forth.

f 2.- A combined T-square and section-liner, comprising a cross-head and connected blade, a bar having a sliding dovetail connection fwith saidhead and being provided with a rack on that edge located within the latter, a pinion located within a recess in the cross-head and engaging with said rack, an operatingspindle carried by the cross-head having congnection wit-l1 said!" pinion to operate the same land being arranged withone end projecting above theupp'er surfaceof the cross-head to vbe operated, a second toothed or notched disk "secured on said spindle-'at apointwithin the cross-head, and a"sp1 i ngclick engaging with said toothed or notched'disk, substantially as .and for the purpose set forth.

3. Av combined T-sqnare and section-liner, comprising a cross-head'and connected blade, a' bar having asliding connection with said head and provided-'with pins movably sup-- ported within recesses in one side thereof, means for eDgaging'Withand'moving said pins to and froma lpositionwith their'ends extending beyond the surface `of the bar, and means for' operating the' said head and connected fblade with a step-by-step movement relative tosaid bar. j j

4. Acombined T-square and section-liner, comprising a cross-head and connected blade, ialba'r having a sliding'connection with said lhead and providedwith a pin movablysupported Withina recess in one side-thereof, a `sliding rod supportedby the cross-head havfing a bent or cam portionv for engagingwithv ,and moving'said pin to and from a p'osition @with its endextending beyondthe surface of the bar, and-means foroperatin g the/said head and connected blade with a step-by-step'move- :ment relative to said bar.

5. A combined T-squa'reand section-liner, comprisin g a' cross-head and connected blade, a bar having a sliding connection with said head' and provided with' pins rnovably support`ed within recesses in one side-thereof, an operating-:bar operatively conn'ectedwith sa'id :pins'to mo've'the same to and'from a'position ,with their ends extending beyond the surface yof the bar, and means for operating the said ,head and connected blade with a step-by-step movement relative to said bar.

CHARLES S. COX.

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